2008-03-31   3.909
2008-04-28   3.831
2009-04-21   4.035
2009-05-06   4.151
2010-04-01   4.070
2010-09-30   3.811
2011-03-26   3.709
2013-03-13   3.962
2014-03-17   3.947
2014-09-22   3.870
2015-06-25   3.792
2015-07-25   3.878
2017-02-13   3.818
2017-05-20   4.135